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RE: Engines for 1/2, 1/3, 1/4 scale rc cars.

Half scale is pretty big, check out the Project Mammuth thread, that might give you ideas. As for 1/4 scale, you can use the same engines that are used in 1/5 scale. The higher end engines have more than enough power, so as long as your gearing is reasonable it will work fine. I don't know how much money you want to spend but there are a number of big block conversions for zenoah or CY engines out there, as well as some 60cc models out there. But unless your car is ridiculously heavy, a higher end modified CY or zen will do fine. There are also inline engines available.

RE: Engines for 1/2, 1/3, 1/4 scale rc cars.

i'm currently building a 1/4 scale foff jeep...will weigh about 40-45lbs...i've an obr 57cc twin going in it which will give close to the same hp per tonne as a full size at around 950. even though i'm sure a full mod 30.5 would spin the wheels to get the scale performance bigger is better imo.
for half scale i'd be thinking a 125cc and up, 2 stroke dirtbike or cart motor or a bigger 4 stroke

RE: Engines for 1/2, 1/3, 1/4 scale rc cars.

i was just seeing what other people recomended because if i find a bigger cheap motor i might put it on my go kart rc car. It currently has two 50cc two stroke pocket bike engines with cvt trannys they are kinda slow so i was seeing what else was out there. There are pics and a link to the vid on my other thread.

RE: Engines for 1/2, 1/3, 1/4 scale rc cars.

Chinese minicross engine from a Thumpstar or equivalent. 4-stroke gas, 125cc, +12hp. Take the rotating assembly and put them into an old Honda Monkey 3-speed semiautomatic (clutchless manual). Then use a servo to engage gears with a 3rd or 4th channel. Will be enough power for a big and heavy model. Steering servos would need to be BEEFY to have sufficient torque and not burn up.